anyone know what tells the post heat cycle on the heater plugs to cease after initial start?
regards Jim

- (#5228) J Adgo, 25 Aug 02

thermal sensor on LHS of block, above starter. This switches the relay in the L/H "B" pillar via the timer. The relay controls the feed through the glow plug resistor on the inlet manifold.

- (#5229) david miller, 25 Aug 02

ta dave , just checking as u know ive fitted the durite gauge and wanted to check the post heat was not controlled from the now disconnected old gauge sensor

by the way .. found that the temp is about 95 running about now - still too hot in my opinion .. im going to make an air scoop to fit under the front crossmember near the power steer rack to force some air into it and i might go for the pacet option if that dont improve things - im determined to get this engine down to 85
jim

- (#5289) J Adgo, 27 Aug 02

Jim, I would suggest that 85 degrees would be too cold for our engines to run, if indeed you can get it that low, most engines run at above 100c, indeed the fans aren't set to come on until 103-105c, Toyota would have designed it so they would come on at about a 5-8c increase from 'norm', so they intend the engine to run at between 95-100c. If you run it any colder, it will probably use more fuel, be less powerful & could lead to other problems. Why do you think that pressurised cooling systems were introduced in the late 1920's to allow engines to run hotter than the boiling point of water ie 100c, this makes them more efficient. If you currently have a constant & unrising temperature of 95c, & it doesn't seem to waver from that, I would stick with it. Regards Rob.

- (#5290) Rob Drinkwater, 27 Aug 02

I'm inclined to agree with Rob here because(so I am told) running the engine, constantly, at too low a temperature, is not good. I have posted my results, ie, viscous fan, Toyota 30mm opening stat with three, 3mm by-pass holes, sealed radiator, ie, no air gaps around the fan shroud, etc, etc. My engine is probably running slightly cool and it may be that I will have to close one of the stat's 3mm holes as winter approaches. I am sure also that David is right and the cooling system faults are more to do with water flow than air flow. However, as we all know, our cooling systems and head vunerability, do lead to some major problems but David's hard work, and the advice of others, has now given me a more "controllable" system and a temperature gauge which actually works.
Also, for those who are interested, I have ordered a new viscous fan coupling. Cost is £123 plus VAT. (Ouch)

- (#5291) John Davis, 27 Aug 02